51263617133 has 4 divisors (see below), whose sum is σ = 51266934240. Its totient is φ = 51260300028.

The previous prime is 51263617129. The next prime is 51263617159. The reversal of 51263617133 is 33171636215.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51263617133 - 2² = 51263617129 is a prime.

It is a super-2 number, since 2×51263617133² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51263617193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1635263 + ... + 1666316.

It is an arithmetic number, because the mean of its divisors is an integer number (12816733560).

Almost surely, 2^51263617133 is an apocalyptic number.

It is an amenable number.

51263617133 is a deficient number, since it is larger than the sum of its proper divisors (3317107).

51263617133 is a wasteful number, since it uses less digits than its factorization.

51263617133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3317106.

The product of its digits is 68040, while the sum is 38.

The spelling of 51263617133 in words is "fifty-one billion, two hundred sixty-three million, six hundred seventeen thousand, one hundred thirty-three".